Magnetic and transport properties of micron size magnetic particulate arrays fabricated on a 2D superconducting Nb films and sub-micron magnetic wires

Yoshichika Otani; Kazuaki Fukamichi; Osamu Kitakami; Yutaka Shimada; Bernard Pannetier; Jean Pierre Nozieres; Tsuyoshi Matsuda; Akira Tonomura

Magnetic and transport properties of micron size magnetic particulate arrays fabricated on a 2D superconducting Nb films and sub-micron magnetic wires

Yoshichika Otani, Kazuaki Fukamichi, Osamu Kitakami, Yutaka Shimada, Bernard Pannetier, Jean Pierre Nozieres, Tsuyoshi Matsuda, Akira Tonomura

Division of Inorganic Material Research

Research output: Contribution to journal › Conference article › peer-review

31 Citations (Scopus)

Abstract

Micron size particulate arrays of amorphous R-Co (R = Sm and Gd) alloys with a thickness of 200 nm were fabricated on top of a 20 nm thick Nb film by means of e-beam lithography and sputter deposition. The arrays consist of 2 × 2 μm² square particles with a spatial periodicity of 4 μm along an edge of the square. Interesting oscillations due to the fluxoid quantization were observed both in the transition lines and the magnetization curves of the underlying Nb film. The superconducting state of the Nb film was found to be modulated by stray fields of the square magnetic particles. Sub-micron size ferromagnetic Fe wires were also prepared in order to investigate the magnetoresistance effect associated with pinning and depinning processes of a magnetic domain wall confined in the wire. Low temperature transport, Lorentz microscopy and electron holography measurements demonstrated a clear change in resistivity associated with the depinning of a pinned single domain wall.

Original language	English
Pages (from-to)	215-225
Number of pages	11
Journal	Materials Research Society Symposium - Proceedings
Volume	475
Publication status	Published - 1997 Dec 1
Event	Proceedings of the 1997 MRS Spring Meeting - San Francisco, CA, USA Duration: 1997 Mar 31 → 1997 Apr 2

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Magnetic and transport properties of micron size magnetic particulate arrays fabricated on a 2D superconducting Nb films and sub-micron magnetic wires. / Otani, Yoshichika; Fukamichi, Kazuaki; Kitakami, Osamu; Shimada, Yutaka; Pannetier, Bernard; Nozieres, Jean Pierre; Matsuda, Tsuyoshi; Tonomura, Akira.

In: Materials Research Society Symposium - Proceedings, Vol. 475, 01.12.1997, p. 215-225.

Research output: Contribution to journal › Conference article › peer-review

Otani, Yoshichika ; Fukamichi, Kazuaki ; Kitakami, Osamu ; Shimada, Yutaka ; Pannetier, Bernard ; Nozieres, Jean Pierre ; Matsuda, Tsuyoshi ; Tonomura, Akira. / Magnetic and transport properties of micron size magnetic particulate arrays fabricated on a 2D superconducting Nb films and sub-micron magnetic wires. In: Materials Research Society Symposium - Proceedings. 1997 ; Vol. 475. pp. 215-225.

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abstract = "Micron size particulate arrays of amorphous R-Co (R = Sm and Gd) alloys with a thickness of 200 nm were fabricated on top of a 20 nm thick Nb film by means of e-beam lithography and sputter deposition. The arrays consist of 2 × 2 μm2 square particles with a spatial periodicity of 4 μm along an edge of the square. Interesting oscillations due to the fluxoid quantization were observed both in the transition lines and the magnetization curves of the underlying Nb film. The superconducting state of the Nb film was found to be modulated by stray fields of the square magnetic particles. Sub-micron size ferromagnetic Fe wires were also prepared in order to investigate the magnetoresistance effect associated with pinning and depinning processes of a magnetic domain wall confined in the wire. Low temperature transport, Lorentz microscopy and electron holography measurements demonstrated a clear change in resistivity associated with the depinning of a pinned single domain wall.",

author = "Yoshichika Otani and Kazuaki Fukamichi and Osamu Kitakami and Yutaka Shimada and Bernard Pannetier and Nozieres, {Jean Pierre} and Tsuyoshi Matsuda and Akira Tonomura",

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T1 - Magnetic and transport properties of micron size magnetic particulate arrays fabricated on a 2D superconducting Nb films and sub-micron magnetic wires

AU - Otani, Yoshichika

AU - Fukamichi, Kazuaki

AU - Kitakami, Osamu

AU - Shimada, Yutaka

AU - Pannetier, Bernard

AU - Nozieres, Jean Pierre

AU - Matsuda, Tsuyoshi

AU - Tonomura, Akira

PY - 1997/12/1

Y1 - 1997/12/1

N2 - Micron size particulate arrays of amorphous R-Co (R = Sm and Gd) alloys with a thickness of 200 nm were fabricated on top of a 20 nm thick Nb film by means of e-beam lithography and sputter deposition. The arrays consist of 2 × 2 μm2 square particles with a spatial periodicity of 4 μm along an edge of the square. Interesting oscillations due to the fluxoid quantization were observed both in the transition lines and the magnetization curves of the underlying Nb film. The superconducting state of the Nb film was found to be modulated by stray fields of the square magnetic particles. Sub-micron size ferromagnetic Fe wires were also prepared in order to investigate the magnetoresistance effect associated with pinning and depinning processes of a magnetic domain wall confined in the wire. Low temperature transport, Lorentz microscopy and electron holography measurements demonstrated a clear change in resistivity associated with the depinning of a pinned single domain wall.

AB - Micron size particulate arrays of amorphous R-Co (R = Sm and Gd) alloys with a thickness of 200 nm were fabricated on top of a 20 nm thick Nb film by means of e-beam lithography and sputter deposition. The arrays consist of 2 × 2 μm2 square particles with a spatial periodicity of 4 μm along an edge of the square. Interesting oscillations due to the fluxoid quantization were observed both in the transition lines and the magnetization curves of the underlying Nb film. The superconducting state of the Nb film was found to be modulated by stray fields of the square magnetic particles. Sub-micron size ferromagnetic Fe wires were also prepared in order to investigate the magnetoresistance effect associated with pinning and depinning processes of a magnetic domain wall confined in the wire. Low temperature transport, Lorentz microscopy and electron holography measurements demonstrated a clear change in resistivity associated with the depinning of a pinned single domain wall.

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